3 Do not let loyalty and faithfulness forsake you;
bind them around your neck,
write them on the tablet of your heart. Proverbs 3:3

2 keep my commandments and live,
keep my teachings as the apple of your eye;
3 bind them on your fingers,
write them on the tablet of your heart. Proverbs 7:2-3

But this is the covenant that I will make with the house of Israel after those days, says the LORD: I will put my law within them, and I will write it on their hearts; and I will be their God, and they shall be my people. Jeremiah 31:33

I will give them one heart, and put a new spirit within them; I will remove the heart of stone from their flesh and give them a heart of flesh, 20 so that they may follow my statutes and keep my ordinances and obey them. Ezekiel 11:19-20

A new heart I will give you, and a new spirit I will put within you; and I will remove from your body the heart of stone and give you a heart of flesh. 27 I will put my spirit within you, and make you follow my statutes and be careful to observe my ordinances. Ezekiel 36:26-27

Rather, a person is a Jew who is one inwardly, and real circumcision is a matter of the heart—it is spiritual and not literal. Romans 2:29

you show that you are a letter of Christ, prepared by us, written not with ink but with the Spirit of the living God, not on tablets of stone but on tablets of human hearts. 2 Corinthians 3:3

In him also you were circumcised with a spiritual circumcision, by putting off the body of the flesh in the circumcision of Christ Colossians 2:11